Abstract

We study effects of changing inter wall hopping on the electronic and structural properties of ( n , n ) @ ( 2 n , 2 n ) and ( n , 0 ) @ ( 2 n , 0 ) double-wall carbon nanotubes using tight-binding model. We found by switching inter-wall interactions a valley opened in the ( n , n ) @ ( 2 n , 2 n ) local density of states, although both walls remained metallic. For the case of ( n , 0 ) @ ( 2 n , 0 ) where n is not multiple of 3 a semiconducting to metallic phase transition is found, while when n is multiple of 3 both inner and outer walls remained metallic.

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